CN113050331B - Frameless liquid crystal display panel - Google Patents

Frameless liquid crystal display panel Download PDF

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Publication number
CN113050331B
CN113050331B CN202110346627.2A CN202110346627A CN113050331B CN 113050331 B CN113050331 B CN 113050331B CN 202110346627 A CN202110346627 A CN 202110346627A CN 113050331 B CN113050331 B CN 113050331B
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substrate
film
liquid crystal
display panel
crystal display
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CN113050331A (en
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李雪云
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
    • G02F1/133723—Polyimide, polyamide-imide
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13458—Terminal pads

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The application discloses a frameless liquid crystal display panel, which has a display area and a non-display area, and comprises: the backlight module comprises a first substrate and a second substrate which are oppositely arranged, wherein the backlight module is oppositely arranged on one side of the second substrate, which is far away from the first substrate; an array layer opposite to the second substrate and a PI film opposite to the array layer; the array layer and the PI film are oppositely arranged on the surface of the second substrate facing the first substrate; the PI thin film extends from the first PI alignment film of the display area to the non-display area to form a PI bending film, and the PI bending film is wound from the upper part of one end of the second substrate to the lower part of the backlight module. According to the frameless liquid crystal display panel, the welding is oppositely arranged on the back surface of the substrate, so that the lower frame of the opposite welding can be eliminated, and no frame or a narrow frame is required; and the PI alignment film and the PI bending film not only change the manufacturing process of the bent PI, but also can improve the display effect.

Description

Frameless liquid crystal display panel
Technical Field
The application relates to the field of display panels, in particular to a frameless liquid crystal display panel.
Background
Liquid crystal displays have been widely used in human life, such as display screens of mobile phones/computers/televisions and the like. With the development of display technology and the requirement of people for the progress of display technology, displays with high screen occupation ratio, full screen and narrow frame and application terminals thereof are gradually developed, however, a frame of a liquid crystal display always needs to be used for setting a bonding pad and is electrically connected with a flexible circuit board and a driving chip bonding, and the frame of the bonding pad part cannot be removed.
In the research and practice process to prior art, this application provides a no frame liquid crystal display panel, has eliminated LCD and has set up the lower frame of pad, realizes no frame or narrow frame effect, still can promote the display effect simultaneously.
Disclosure of Invention
The embodiment of the application provides a frameless liquid crystal display panel, wherein a bonding pad is arranged on the back surface of a substrate, so that a lower frame for arranging the bonding pad is eliminated, and frameless or narrow frames are realized; the alignment PI and the bending PI in the application simplify the manufacturing process of the bending PI, the thickness of each film layer of the display area is not increased, and the display effect is improved.
The embodiment of the application provides a no frame liquid crystal display panel, has display area and non-display area, no frame liquid crystal display panel includes: the backlight module comprises a first substrate and a second substrate which are arranged oppositely, wherein a backlight module is arranged on one side of the second substrate, which is far away from the first substrate;
an array layer disposed on the second substrate and a Polyimide (PI) film disposed on the array layer; the array layer and the PI film are arranged on the surface, facing the first substrate, of the second substrate;
the PI thin film extends from the first PI alignment film of the display area to the non-display area to form a PI bending film, and the PI bending film is wound from the upper part of one end of the second substrate to the lower part of the backlight module.
Optionally, in some embodiments of the present application, a pixel electrode and a connection line are disposed on a surface of the PI thin film, the pixel electrode is disposed on a surface of the first PI alignment film, and the connection line is disposed on a surface of the PI thin film in the non-display area.
Optionally, in some embodiments of the present application, an array trace is further disposed between the array layer and the PI film, and the connection line is connected to the array trace.
Optionally, in some embodiments of the present application, in the non-display region, a thickness of a portion of the array layer is reduced, and at the same time, a thickness of the PI bending film corresponding to the reduced thickness of the array layer is increased.
Optionally, in some embodiments of the present application, a pad is disposed on the PI bending film, and the pad is connected to an end of the connection line.
Optionally, in some embodiments of the present application, the pad is disposed below the second substrate and on a surface of the PI bending film.
Optionally, in some embodiments of the present application, the display panel further includes a flexible circuit board, and the flexible circuit board is connected to the pad.
Optionally, in some embodiments of the present application, the flexible circuit board is disposed on a side of the backlight module facing away from the second substrate.
Optionally, in some embodiments of the present application, a chip is disposed on the flexible circuit board.
Optionally, in some embodiments of the present application, a second PI alignment film is disposed on a side of the first substrate facing the second substrate, and is disposed opposite to the PI thin film.
Optionally, in some embodiments of the present application, a liquid crystal layer is formed between the first substrate and the second substrate by enclosing with frame glue, and the liquid crystal layer is located between the first substrate and the second substrate which are oppositely disposed.
Optionally, the pixel electrode includes a plurality of strip electrodes arranged at intervals.
Correspondingly, the embodiment of the application further provides a manufacturing method of the frameless liquid crystal display panel, which comprises the following steps:
s1: completing the manufacture of the array film layer part film layer (the array layer and the array wires on the second substrate, and the backlight module) in the display panel;
s2: transferring or coating Polyimide (PI) to form alignment PI and bending PI, and curing;
s3: patterning the metal layer on the polyimide to respectively form a pixel electrode, a connecting wire and a bonding pad;
s4: rubbing (rubbing) alignment is performed, or photo-alignment is performed after alignment assembly of liquid crystal is dropped.
The PI extends from the alignment PI of the panel display area to the bending PI of the non-display area, and the bending PI winds below the backlight module on the back of the substrate. The pixel electrode is located on the alignment PI of the display area. The pixel electrode, the connecting wire and the bonding pad are arranged on the same layer.
The beneficial effect of this application:
the display panel eliminates the lower frame of the pad arranged on the liquid crystal display, has a frameless or narrow frame effect, simultaneously transfers PI and bent PI to the substrate, does not increase the thickness of each film layer of the array substrate of the display area, can achieve a good display effect, simultaneously forms the bent PI and the bent PI, simplifies the manufacturing process of the bent PI, and has the beneficial effect of simple manufacturing process.
In the display panel, the pixel electrode on the lower substrate is arranged on the PI film and specifically arranged on the first PI alignment film in the display area, at the moment, the liquid crystal display can be an FFS/IPS display, the pixel electrode is a strip electrode, and the alignment film between the strip electrodes can also align the liquid crystal layer. Meanwhile, no electrode on the surface of the alignment film of the upper substrate is aligned to the liquid crystal layer normally. Since the alignment film between the stripe-shaped pixel electrodes and the alignment film of the upper substrate align the liquid crystal molecules, the liquid crystal molecules above the pixel electrodes are also aligned by van der waals force.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a first schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a portion of the display panel shown in FIG. 2;
fig. 4 is a schematic diagram of a partial structure of the display panel provided in fig. 2.
Description of reference numerals:
Figure BDA0003000923340000031
Figure BDA0003000923340000041
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
The embodiment of the application provides a frameless liquid crystal display panel. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.
The embodiment of the application provides a frameless liquid crystal display panel which is provided with a display area and a non-display area. Referring to fig. 1 or fig. 2, the borderless liquid crystal display panel includes: a first substrate 110 and a second substrate 120 disposed opposite to each other. The display panel further includes an array layer 101, an array trace 102, a PI film 103, a pixel electrode 1041, a connecting line 1042, and a pad 1043. In the display panel, a backlight module 140 is disposed on a side of the second substrate 120 away from the first substrate 110.
Referring to fig. 1 and 2, the array layer 101 is disposed on the second substrate 120. The PI film 103 is disposed on the array layer 101. The array layer 101 and the PI film 103 are disposed on a side of the second substrate 120 facing the first substrate 110. Specifically, the array layer 101 is disposed on a surface of the second substrate 120 facing the first substrate 110; the PI film 103 is disposed on a surface of the array layer 101 facing the first substrate 110.
Further, referring to fig. 1, the PI thin film 103 includes a first PI alignment film 103a and a PI bending film 103 b. Specifically, the PI thin film 103 includes a first PI alignment film 103a of the display region, and a PI bending film 103b extending from the first PI alignment film 103a of the display region to the non-display region. The PI bending film 103b is wound from above one end of the array layer 101 on the second substrate 120 to below the backlight module 140.
Further, the array trace 102 is disposed between the array layer 101 and the PI film 103. Further, the array trace 102 is disposed in the display region, that is, the array trace 102 is disposed between the first PI alignment film 103a and the array layer 101. Both ends of the array layer 101 are connected to the PI film 103.
In the display area, the pixel electrode 1041 is disposed on the surface of the PI film 103. That is, the pixel electrode 1041 is disposed on the surface of the first PI alignment film 103 a. Further, the pixel electrode 1041 may be a plurality of strip-shaped electrodes arranged at intervals.
The connecting lines 1042 are arranged on the surface of the PI film 103. The connecting lines 1042 are disposed on the surface of the PI film 103 in the non-display region. Moreover, the connecting wires 1042 are electrically connected to the array traces 102.
In an embodiment, a pad 1043 is disposed on the PI bending film 103 b. The pad 1043 is connected to an end of the connecting line 1042. Further, the pad 1043 is disposed below the second substrate 120 and on a surface of the PI bending film 103 b.
In an embodiment, the pixel electrode 1041, the connecting line 1042 and the pad 1043 are disposed in the same layer.
In one embodiment, the display panel further includes a flexible circuit board 150. The flexible circuit board 150 is disposed on a side of the backlight module 140 away from the second substrate 120. Specifically, the flexible circuit board 150 is provided with a chip 1501. Further, the flexible circuit board 150 is connected to the pad 1043.
Obviously, the PI bending film 103b is bent to the back of the panel and connected to the flexible circuit board 150 and the driving chip 1501, so that the liquid crystal display can display without a lower frame.
In another embodiment, referring to fig. 2, fig. 3 and fig. 4, in the non-display area, the thickness of a portion of the array layer 101 is reduced, and meanwhile, the thickness of the PI bending film 103b corresponding to the reduced thickness of the array layer 101 is increased, so that the thickness of the bending PI is increased, and the strength of the bending PI is improved. Referring to fig. 3, the array layer 101 disposed at the position corresponding to the bending position of the PI bending film 103b is thinned, for example, the flat layer is removed to reduce the thickness of the array layer 101, for example, the color resist layer and the flat layer are removed at the position corresponding to the bending PI (PI bending film 103b) on the COA substrate, thereby increasing the thickness of a part of the PI bending film 103 b.
In one embodiment, a second PI alignment film 105 is disposed on a side of the first substrate 110 facing the second substrate 120. Further, the second PI alignment film 105 is disposed opposite to the PI thin film 103.
In an embodiment, the liquid crystal layer 106 is formed between the first substrate 110 and the second substrate 120 by enclosing with a sealant 130. The liquid crystal layer 106 is located between the first substrate 110 and the second substrate 120 which are oppositely disposed. That is to say, the liquid crystal layer 106 is located between the PI thin film 103 and the second PI alignment film 105 which are oppositely disposed, and the liquid crystal layer 106 is formed in a space surrounded by the first substrate 110, the second substrate 120 and the sealant 130.
The embodiment of the present application further provides a method for manufacturing a frameless liquid crystal display panel, including:
s1: completing the manufacture of the array film layer part film layer (the array layer 101 and the array traces 102 on the second substrate 120, and the backlight module 140) in the display panel;
s2: transferring or coating Polyimide (PI) to form alignment PI and bending PI, and curing;
s3: patterning the metal layer on the polyimide to respectively form a pixel electrode, a connecting wire and a bonding pad;
s4: rubbing (rubbing) alignment is performed, or photo-alignment is performed after alignment assembly of liquid crystal is dripped.
In this embodiment, the PI extends from the alignment PI of the display region of the panel to the bending PI of the non-display region, and the bending PI winds under the backlight module on the back of the substrate. The pixel electrode is located on the alignment PI of the display area.
Since the pixel electrode, the connection line, and the pad are obtained from a metal layer, the pixel electrode, the connection line, and the pad are disposed in the same layer.
In summary, the pixel electrode on the lower substrate of the display panel is disposed on the PI thin film, and specifically disposed on the first PI alignment film in the display region, at this time, the liquid crystal display may be an FFS/IPS display, the pixel electrode is a strip electrode, and the alignment film between the strip electrodes may also align the liquid crystal layer. Meanwhile, no electrode on the surface of the alignment film of the upper substrate is aligned to the liquid crystal layer normally. Since the alignment film between the stripe-shaped pixel electrodes and the alignment film of the upper substrate align the liquid crystal molecules, the liquid crystal molecules above the pixel electrodes are also aligned by van der waals force.
The display panel eliminates the lower frame of the pad arranged on the liquid crystal display, has a frameless or narrow frame effect, simultaneously transfers PI and bent PI to the substrate, does not increase the thickness of each film layer of the array substrate of the display area, can achieve a good display effect, simultaneously forms the bent PI and the bent PI, simplifies the manufacturing process of the bent PI, and has the beneficial effect of simple manufacturing process.
The foregoing describes in detail a frameless liquid crystal display panel provided in an embodiment of the present application, and a specific example is applied in the present application to explain the principle and the implementation manner of the present application, and the description of the foregoing embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A frameless liquid crystal display panel, which is provided with a display area and a non-display area, is characterized by comprising: the backlight module comprises a first substrate and a second substrate which are arranged oppositely, wherein a backlight module is arranged on one side of the second substrate, which is far away from the first substrate;
the array layer is arranged on the second substrate, and the PI film is arranged on the array layer; the array layer and the PI film are arranged on the surface, facing the first substrate, of the second substrate;
the PI thin film extends from the first PI alignment film of the display area to the non-display area to form a PI bending film, and the PI bending film is wound from the upper part of one end of the second substrate to the lower part of the backlight module;
wherein, in the non-display area, the thickness of part of the array layer is reduced, and simultaneously, the thickness of the PI bent film corresponding to the reduced thickness of the array layer is increased.
2. The frameless liquid crystal display panel of claim 1, wherein a surface of the PI film is provided with a pixel electrode and a connection line, the pixel electrode is disposed on a surface of the first PI alignment film, and the connection line is disposed on a surface of the PI film in the non-display area.
3. The frameless liquid crystal display panel of claim 2, wherein an array trace is further disposed between the array layer and the PI film, and the connection line is connected to the array trace.
4. The frameless liquid crystal display panel of claim 2, wherein a pad is disposed on the PI bending film, and the pad is connected to an end of the connection line.
5. The frameless liquid crystal display panel of claim 4, wherein the bonding pads are disposed below the second substrate and on a surface of the PI bending film.
6. The bezel-less liquid crystal display panel of claim 4, wherein the display panel further comprises a flexible circuit board connected with the pad.
7. The bezel-less liquid crystal display panel of claim 6, wherein the flexible circuit board is disposed on a side of the backlight module facing away from the second substrate.
8. The frameless liquid crystal display panel of claim 6, wherein a chip is disposed on the flexible circuit board.
9. The frameless liquid crystal display panel of claim 1, wherein a second PI alignment film is disposed on a side of the first substrate facing the second substrate, opposite to the PI thin film.
10. The bezel-free liquid crystal display panel according to claim 1, wherein a liquid crystal layer is formed between the first substrate and the second substrate by surrounding with a sealant, and the liquid crystal layer is located between the first substrate and the second substrate which are oppositely arranged.
CN202110346627.2A 2021-03-31 2021-03-31 Frameless liquid crystal display panel Active CN113050331B (en)

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